I want to make a .iso to backup my computer - disk utility won't let me

Just like the title says - disk utility refuses to back up my computer as a disk image. I've tried the hard disk, and the Mac HD volume, but it both cases disk utility tells me "resource busy"...***? What should I do to get around this problem? I thought it might be errors on my hard disk or hd volume, but disk utility seems impotent to take any action saying:
"Verifying volume “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
Volume Header needs minor repair
The volume Macintosh HD needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
Are these processes related? Are errors on my HD volume causing disk utility to not backup my computer?
Any and all help is appreciated!
Vincenso

Vincenso, you need to repair that error first, but it can't be done while booted from it.
"Try Disk Utility
1. Insert the Tiger Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then Safe Boot , (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it finishes.
And where are you trying to put the ISO?
Get carbon copy cloner to make an exact copy of your old HD to the New one...
http://www.bombich.com/software/ccc.html
SuperDuper...
http://www.shirt-pocket.com/SuperDuper/
Have a look at Synchronize! Pro X 6.0.5
http://www.macupdate.com/info.php/id/6897/synchronize!-pro-x
Or the most expensive one & my favorite, Tri-Backup...
http://www.tri-edre.com/english/tribackup.html

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